›coming before or done to prepare for a main or more important action, event, etc: preliminary data/numbers/statisticsThe preliminary numbers indicate that all classes of creditors have accepted the plan.A final report showed inflation rising 2.4%, up from a preliminary estimate of 2.3%.He emphasized that the commissioner's decision is only preliminary.The National Transportation Safety Board, in a preliminary report, did not say what may have caused the crash.The case was dismissed because prosecutors were not ready for the preliminary hearing.preliminary agreement/approval/decisionThe commission has given preliminary approval to another 27 projects totaling $3.1 billion.a preliminary inquiry/investigationAt present a preliminary investigation is under way.preliminary discussions/meetings/talks